#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
void setup() {
  // put your setup code here, to run once:
  lcd.begin();  //initialize the lcd
  lcd.backlight();
}

void loop() {
  // put your main code here, to run repeatedly:
  lcd.setCursor(0,0);
  lcd.print("hello, world!");
  delay(500);
  lcd.clear();
}
